Carbureter.



W.J. BENSON.

Patented M211. 19, 1918.

mvamtoz Witnesses WILLIAM J. BENSON, OF PHILADELPHIA, PENNSYLVANIA.

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Specification of Letters Patent.

Patented Mar. 19, 1218.

Application filed December 13, 1915. Serial No. 66,587.

To all whom it may concern:

Be it known that 1, WILLIAM J. BENsoN, a citizen of the United States residing at Philadelphia, in the county of lhiladelphia and State of Pennsylvania, have invented new and useful Improvements in Carbureters, of which the following is a specification.

This invention relates to improvements in carbureters, and an object thereof is to provide an improved structure whereby a proper roportion or" combustible fuel is automatically supplied to an engine in direct ratio to the speed at which the latter is operating.

Another object of the invention is to provide a carbureter with a plurality of air and fuel admitting openings in communication with a mixing chamber, means being provided for automatically and independently opening or closing these openings in ac cordance to the fuel demands of the engine.

A further object of the invention is to provide a carburcter of this character which will eliminate the necessity of using coiled springs, float valves, spray nozzles andvarious other forms of sensitive and fragile mechanisms, which are now enerally found upon the usual forms of cafbureters, thereby providing a carbureter which, while highly eihcient, is of strong durable construction, of few and simple parts, and capable of withstanding all shocks or jolts without in any way affecting the operation thereof.

A still further object of the invention is to provide a carbureter in which the liquid fuel therein cannot be reached by burning gases resulting from the engine back-firing, thereby avoiding explosions or fires.

In the further disclosure of the invention reference is to be had to the accompanying drawings, constituting a part of this specification, in which similar characters of reference denote corresponding parts in all of the views, and in which 1 Figure 1 is a vertical diametrical sectional view of the carburetor cOmpriSing one of the preferred forms of the Present invention. V

Fig. 2 is a side elevation of the same,

Fig. 3 is a top plan view,

Fig. 4 is a horizontal sectional view on the line 4-4 of Fig. 1.

Fig. 5 is a similar view on the line 5-5 of Fig. 1,

Fig. 6 is a bottom plan view, and

Fig. 7 is a fragmentary section 'on the line 77 of Fig. 1. Referring more particularly to the drawlngs, the numeral 10 designates the casing of a carbureter comprising the present invention. The casing is of tubular formation, being formed with upper and lower sections 11 and 12, which are threadedly connected as indicated at 13. The upper extremity of the casing 11 is suitably connected with the intake manifold of an internal combustion engine (not shown), and the interior thereof is provided with the usual form of throttle valve 14, which regulates the flow of the combustible mixture, generated by the carbureter, to the engine. The valve 14 is operated by the usual 1ever 15. Y i

The hollow interior 16 of the section 12 is utilized as a mixing chamber wherein the fuel and air are commingled prior to being drawn into the engine; the special method of admitting the combustible products into the mixing chamber 16 will be set forth with particularity hereinafter, as it is upon this feature that the novelty of the present invention resides.

The lower extremity of the section 12 is slightly enlarged to provide an annular fuel well 17 fed bya valved supply pipe 18 extending from a suitable source of fuel supply. A plurality of ports 19 connect the well 17 with the mixing chamber 16, thereby providing passages for discharging fuel from the well to said mixing chamber. Air ducts or openings 20 are also formed in the section 12, to provide passageways for the admission of air into the mixing chamber, said openings 20 being preferably arranged in substantially vertical alinement With the ports 19.

Secured as at 21 to the wall of the mixing chamber 16, and completely covering the ports and openings 19 and 20 respectively, are leaf springs 22, in this instance consisting of springs a, b and c, which differ in resiliency.

In reference to the operation of the above described parts, the suction created by the action of the o eratin en ine is transto O mitted directly to the mixing chamber 16 containing the port covering springs 22. 1f the engine 'isrunning at a reduced rate of speed the suction derived therefrom will be of sufficient strength to actuate the spring 0 deflecting the latter outwardly from its point of suspension 21 and simultaneously uncovering the respective admission ports of the carbureter. This action results in admitting a quantity of air and fuel into the mixing chamber, where rthe two fluids are commingled and drawn into the engine cylinders at the proper proportion for the operation of the en ine, when the latter is running relatively ".s' owly.

"Increased suction will pull the spring .0 inwardly until it contacts with a stop member '23, which yie'ldingly resists its movement resulting in the operation. of the spring 7) so as :to open the ports covered thereby and thus supplying an additional amount of fuel .to'the engine which will I mee't the increased fuel demands thereof.

When the demand of the engine :still increases ;the resistance of the spring a will be overcome and the carbureter will thenbe supplying therengine with combustible mix 'ture -to its fullest-capacity' Incidentally, it is well to state'that there are no rests or pauses between the actions of "the springs '22; In other words as soonas the spring c has reached .its limit of movement, and "the engine is accelerating its speed, the spring t will synchronously open with -the :stopping of the spring c,;-thereby permitting of a continuous fuel "feed 'to meet {the require ments of the engine, eliminating the mter mittent features of fuel supply which characterizes the operation of the usual-carbureter. V 7

- The air supplied to the air inlet openings 20 is preheated before it"enters the mixing chainloer i1 6. 'This'is accomplished by placing a casing '25 around the lower section 112, the lower edge of the casing resting upon the ,enlarged lower end of said section 12 and having its upper extremity secured as at 26 to an enlarged collar 27 formed .on the section 11. A horizontally extending duct is i tegrally formed with the casing 25 and extends within close proximity of the exhaust manifold of an en- ;gine s0 that the air drawn through the duct "28,, into the casing 25, will be in a heated condition. Arotatable'collar '29, provided on the duct 28, is formed with openings 3'0 for registration with similar, openings formed in said duct. These openings are "placed in alinement when colder air is wantedin the carbureter, ,or for combining the air rece1ved around the exhaust of the engine with that of a colder degree for pro-' duc ing certain results in the carbureter.

The fuel supply of the carbureter is also capable of adjustment and as shown the supply of fuel which enters the mixing.

chamber 16 from the well 17 by way of the ports 19, :is regulated "by needle valves 31. Y

The latter consist merely of threaded hand .screws82, threaded into openings 33 formed 1n the section 12, in al'inement with the ports -19, Tapered ends 3% are provided on each of said valves so that upon the manipulaition thereof the tapered ends will cooperate with the ports 19 to either close, partially "obstruct 'or to fully open the same, thus controlling the flow of fuel therethrougl1.:A locknnt'35 is placed 'upon said valve to prevent accidental displacement thereof after being regulated.

Hinged "to the "bottom of the lower section 12'isa swinging door36 the primary purpose of which is to prevent air from being drawninto the mixing chamber 16 from points other than the openings '20-; a

spring 37 exerts i an upward pressure on the 1 wallof themiXing chamber, thereby'posi tively preventing accidents, such :as fire, oc-

currlng by the ignition of fuelby the burn ing gases.

it W111 thus-*be seen that there is new If the engine "should mechanism in which the objects of"this*in- 'vention are achieved and all the advantageous features above :mentioned are,

among others, present. The device :is .positive in action, of few {parts and simple construction. Thexpar'ts ares'o disposed as to prevent crowding, but, nevertheless, are compactly arranged so as .to minimize the size of'the carbureter. "The several changes of relation can be accomplished expeditiously with a small amount of labor and when the parts are once set the mechanism is of such character as to he insured against accidental displacement, thus rendering the action of the'carbureter thoroughly reliable. Having described the invention what is claimed as new is':-- V

1. In .a carburet'er, .a mixing chamber formed with a circular series of sets of admission ports, each set of ports comprising a fuel inlet port and an air inlet port, and

an inwardly yielda'b'le closing membercontrolling both ports of each set, each con v trolling member differing from all of "the others in the degree of resistance to the port opening movement thereof. it i 2. In a carbureter, a mixing chamber having a circular series of sets of admission port's, each set comprising'an air inletport and a fuel inlet port, an inwardly opening resilient valve for each set of ports, and a thereof, each of said valves varying from yieldable stop member for each of said all the others in its degree of resiliency.

valves arranged normally in spaced relation In testimony whereof I aflix my signature 19{ to and out of contact with the respective in presence of a Witness.

valve and adapted after a predetermined WILLIAM J. BENSON. degree of movement of the valve to yield- Witness: ingly resist the further opening movement Gr. PERCY Fox.

Copies e! this patent may be obtained for five cents each, by addressing the "Commissioner of Patents,

Washington, D. 0. 

